A sharp transition between a trivial 1D BTW model and self-organized critical rice-pile model M. Bengrine, A. Benyoussef, A. El Kenz, M. Loulidi and F. Mhirech Eur. Phys. J. B, 12 1 (1999) 129-133 Published online: 15 November 1999 DOI: 10.1007/s100510050987